Skiving-machine.



F. RICKS R. G. REID.

SKIVING MACHlNE.

APPLICATION mfp APH. 14. |914.

1 ,206,91 5. Patented Dec. 5, 1916.

2 SHEETS-SHEET l.

l Z5 A 31 WTA/[S5755 nu "30ml nu" @Juud-upm# rammen". n. c

F. RICKS 6L R. G. REID.

SKIVING MACHINE.

APPLICATION FILED APR. 14, 1914.

1 ,2,9 5 Patenited Dec. 5, 1916.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

FRED RICKS AND ROBERT GOW REID, OF LEICESTER, ENGLAND, .ASSIGNORS TO UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A. CORPORATION 0F NEW JERSEY.

SKIVING-MACI-IIN E.

Application filed April 14, 1914.

To all whom t may concern:

Be it known that we, FRED Ricks and ROBERT Grow REID, subjects of the King of England, residing at Leicester, Leicestershire, England, have invented certain Improvements in Skiving-Machines, of which the following description, in connection with the accompanying drawings, is a speci ication, like reference characters on the drawings indicating like parts in the several figures. v

This invention relates to skiving machines and is herein illustrated in connection with a machine for skiving the margin of a piece of leather.

The illustrative machine is of that type in which the stock is fed by a pair of rolls to a knife the cutting edge of which is inclined transversely to the plane of the stock, the rolls being capable of separating to permit the passage of stock which is not uniform in thickness and the knife automatically changing its inclination in accordance with the separation of the rolls.

One feature of the present invention comprises an improved mounting of the knife whereby the axis about which said knife turns as its inclination is varied passes through the central point in its edge.

Another feature of the invention comprises a device for bending the stock at the point where the knife intersects its surface so as to produce a slight shoulder on the bevel or scarf and thereby insure a clean cut.

These and other features of the invention, including certain details of construction and combinations of parts, will be described in connection with an illustrative machine and pointed out in the appended claims.

In the accompanying drawings: Figure 1 is a front elevation partly in section of a skiving machine in which the present invention is embodied. Fig. 2 is a side elevation partly in section of the machine shown in Fig. 1 but drawn to a smaller scale than that figure; Fig. 3 is a detail of the clamp for the knife,and Fig. 4 is an illustration of a piece of leather after it has been scarfed in a skiving machine embodying the present invention.

The illustrated embodiment of the invention comprises a frame 1 in which are mounted upper and lower feed rolls 3 and Specification of Letters Patent.

Patented Dee. 5, 1916.

Serial No. 831,843.

5 respectively. A usual form of driving pulley is provided on a shaft (not shown) parallel to the shafts carrying the rolls, these shafts 7, 9 being driven through gearing so that both of the rolls are driven in order to feed the work. The shaft 7 is rotatably mounted in a bearing 11 which is mounted in a guideway 13 formed in the frame of the machine 1 so that it and the roll 3 can move upwardly 4and downwardly. It will be understood that the bearing l1 of the shaft 7 as well as the bearing 43 of the lower shaft 9 are pivoted at their rear ends (not shown) to the frame of the machine and that said shafts are connected by gears having long teeth so that angular movement in a vertical plane is permitted, such construction being old and well known in skiving machines. The roll 3 is held in its lowermost position by a spring 15 which is mounted in a bore in a boss 19 in the machine frame and bears on the bearing 11. The tension of the spring 15 may be varied by means of a thumb screw which is screwed into the boss 19 and bears upon the spring 15. Y

The bearing 11 is provided with an upwardly extending portion 21 which is provided with a split bearing 23. In this split bearing is mounted a projecting arm 25. The arm 25 is clamped in position in the split bearing by means of a. bolt 27 which draws together the two portions of the said bearing. The position of the upper roll 3 with respect to the lower roll 5 can be varied in order to accommodate it for different thicknesses of work by means of a screw 29 which passes tl'nough a lug 31 projecting laterally from the portion 21 and bears against the frame of the machine, so that when it is turned in one or the other direction the roll 3 will be raised or lowered. The screw 29 is locked in its position of adjustment by means of a nut 33. The arm 25 is provided with a spring-pressed plunger 35 which is adapted to lproject into one or another of a number of holes 37 formed in a bending device 39 in the form of a disk which is rotatably mounted at the front of the roll 3.

The disk 39 is provided with a hub which fits into a recess in the roll 3 and is held in position therein by means of a screw l1 which passes through a hole in the disk and screws into the shaft 7. One of the func- Y that while the feed roll 3 is rotated to feed the work, the disk 39 will be held stationary against which the bearing 73 abuts.

by the spring-pressed plunger' 35. ln use the inner edge of the disk 39 becomes worn by the constant passage of leather past it, but with the arrangement shown 'it can be turnedY on the screw 41 so as to bring a fresh surface into action, the device being locked in kposition by the plunger Y The lower feed roll 5 is keyed to the shaft 9 which is rotatably mounted in a bearing 43 mounted in a guideway 45 in the frame of the machine. ln order to raise and lower the roll 5 when setting it a. bolt 47 is provided which is screwed through a boss on the frame of the machine and bears against a lug projecting from the bearing 43 so that when it is turned in one or the other direction the bearing 43 and consequently the roll 5 will be raised or allowed to descend. The bolt 47 is locked in its position of adjustment by means of a lock nut 49.

The knife 51 is supported in a socket in a 'knife holder 53 and is held in position therein by means of a hooked bolt 55 which passes through a semi-circular groove formed in the lower part of the holder and under the knife 51 and through a hole formed in an enlarged portion of the knife carrier (see Fig. 3). The hooked bolt is half-round throughout most of its extent and is held in position by means of a nut 57.

The knife holder 53 is formed on one end of a spindle 59 which spindle passes through a bearing 61. Surrounding the spindle 59 is a torsion spring 63 one end of which bears against a pin 65 secured to a collar 66 which in turn is secured to the shaft by a screw 67 and the other end of which spring bears against a pin 69 projecting from the bearing 61. The spring 63 tends to turn the knife holder 53 about the axis of the spindle 59 in a direction which, when the machine is viewed as in Fig. 1, is clockwise. This, as will be readily understood, will cause the knife toslope in a direction upwardly from right to left when viewing the knife as in said figure. The bearing 61 is formed on one end of a spindle 71v which is mounted in a bearing 73 which is secured by bolts 75 to abracket 77 projecting from the frame 1. The spindle 71 is held against endwise movement in one direction by means of a collar 79which is secured to the spindle by a screw 81 .andl against endwise movement in the other direction by means of the bearing 61 By (e5 supporting Vthe knife holder 53 in this manner it can move about the axis of the-spindleV and which projects intoa slot 85 formed in I the bearing 73. The purpose of the movement of the knife holder 53 about the axis of the spindle 71 will be understood when the method of operation of the machine is described.

Adjacent the rear face of the feed roll 5 is situated a stationary gage 87. This gage 37 (see particularly F ig. 2) which is somewhat similar to the bending device 39 is in the form of a circular disk and is` adapted to project above theperiphery ofthe lower feed roll, see Fig. 1.V In order to vary the amount which the gage projects above the feed roll 5 it is provided with a slot 89 which Hts over a flattened portion of the bearing 43. The gage 87 is provided with an adjusting screw 91 which is screwed therethrough and which bears against the bearing 43. It is also providedl with a spring 93 which is situated partly in a recess in the gage 87 and partly in a recess in the Dear'- ing 43. The arrangement is such that when the screw is turned in one or the other direction the gage 87 will either be raised by the said screw or allowed to move downwardly under'the action of the spring sothat the amount that the said gage projects above the surface of the feed roll 5 may be varied.

lt will be observed that the top face of the knife 51 bears against the bending device 39 and the lower face against the gage 87, and it will be understood that by raising or lowering the gage 87 the angle of the knife may be varied sov as to vary the angle of the bevel or scarf, the rotation of the knife holder 53 about the axis of the spindle 71 allowing the knife under all normal working conditions to engage boththe device 39 and the gage S7. In addition to varying the angle of the knife by adjusting the gage 87, the thickness of the leather at the point (see Fig. 4) may be varied without materially altering the depth of the cut at the point 97, vas during this adjustment the device 39 acts as a fulcrum so that the knife 51 is virtually swinging about an axis which is adjacent the point at which the knife intersects the top surface of the work. lt'will be understood that movement of the knife about the axis of the spindle 71 allows this adjustment of the knife. rlhe gage 87 also acts as a guide against which the edge of the work bears while it is being operated upon. rlhe work, however, projectsbeyond the device 39 and owing to the fact that this device projects below that part o f the surface of the feed roll adjacent the knife the work is bent over, the lower feed roll 5 at this point, which is the point at which the knife extends beyond the top surface of the material. As the work is bent at this point while it is being cut it will be understood that when subsequently straightened the work at this point, z'. e., the point 97 (see Fig. 4) or the extremity of the feather edge, will be found to have a taper margin that is more obtuse than is the rest of the scarf, and this insures that the bevel shall be of constant width without any waving of the line of the feather edge.

The method of operation is as follows The machine having been started up the ,work is fed by the rolls 3 and 5 to the knife 51 which thus scarfs the work or cuts it to a bevel, as shown in Fig. t. The device 39 at the same time bends the material over the edge of the roll 5 or if the material is of a spongy nature it may not actually be bent over the roll but will have its upper surface compressed and conformed to the roll 3 and the device 39 so as to be deflected locally where the knife extends out of the scarf. Should the work increase in thickness the roll 3 and the device 39 will be moved upwardly by the work, and the knife 5l through the action of the spring 63 will also move angularly, thus the angle of the knife with relation to the work will be varied.

Although the member 39 has been described as a bending device and the member 87 as a gage, it is obvious that the member 87 might also be used as a bending device and that these two members serve as stops to limit the angular movement of the knife about its axis in response to the force of the spring.

Although the invention has been set forth in connection with a particular machine it should be understood that the invention in the scope of its application is not limited to the particular machine which has been shown and described.

Having thus described our invention what we claim as new and desire to secure by Letters Patent of the United States is:

1. A machine of the class described having, in combination, a plurality of feed rolls capable of relative movement to permit the passage of a piece of stock, the thickness of which is not uniform, a knife inclined transversely to the path of the stock and adapted to split said stock on an angle, a pivot for said knife the extended axis of which passes through the central point of the edge of said knife, and yielding means for turning said knife about said axis as the feed rolls recede from each other.

2. A machine of the class described having, in combination, a knife mounted for movement about an axis, a pair of feed rolls for advancing a piece of stock to said knife, a stationary support for one side of said knife, a support for the other side of said knife movable at all times with one of the feed rolls transversely of the direction of feed of the stock, and yielding means tending at all times to move said knife angularly about its axis into contact with said supports.

3. A machine of the class described having, in combination, a knife mounted for movement about an axis, a pair of feed rolls for advancing a piece of stock to said knife, a stationary support for one side of said knife, a support for the other side of said knife movableat all times with one of the feed rolls transversely of the direction of feed of the stock, means whereby said stationary support may be adjusted to vary the inclination of the knife, and yielding means tending at all times to move said knife angularly about its axis into contact with said supports.

Ll. A machine of the class described having, in combination, a knife mounted for movement about an axis, a pair of feed rolls for advancing a piece of stock to said knife, a stationary support for one side of said knife, a support for the other side of said knife movable at all times with one of the feed rolls transversely of the direction of feed of the stock, said stationary support being adjustable with the other of said rolls to vary the angular inclination of the knife, and yielding means tending at all times to move said knife angularly about its axis into contact with said supports.

5. A machine of the class described having, in combination, a pair of feed rolls for advancing a piece of stock, a knife inclined transversely to the plane of the direction of feed, a holder for said knife, resilient means tending continually to move said holder angularly about its axis, stops to limit said angular movement, and a pivot for said knife holder arranged to permit raising and lowering of one corner of said knife to change the inclination of its cutting edge.

6. A machine of the class described having, in combination, a pair of feed rolls for advancing a piece of stock, a knife inclined transversely to the plane of the direction of feed, a holder for said knife, resilient means tending continually to move said holder angularly about its axis, stops to limit said angular movement, a pivot for said knife holder arranged to permit raising and lowering of one corner of said knife to change the inclination of its cutting edge, and means for limiting the extent of movement of said knife holder about said pivot.

7. A machine of the class described having, in combination, a pair of cylindrical feed rolls for advancing a piece of stock, a cutting member inclined transversely to the plane of the stock and adapted to split said stock on an angle, and means for bending said stock at a point adjacent to that in which the cutting member intersects the surface of the stock.

8. A machine of the class described having,in combination, a pair of feed rolls, a cutting member inclined transversely to the plane of theY stock and adapted to split said stock on `an angle, a member for bending said stock at a pointadjacent to that in which the cutting member intersects the surface o1@k saidY stock, and means whereby said bending member may be Vadjustedv to present a fresh surface to said stock.

9. A' machine of the class Ydescribed having, in combination7 a pair of feed rolls for advancing a piece ot stock, yielding means'for causing the stock to be gripped upon an angle, and meansv for bending saidY stock at a point adjacent to th'at'in` which thev cutting member intersects'the surface of said stock. Y Y

In testimony whereofwe havesigned our names to thisv specification in the presence of two subscribing witnesses.

FRED'RICKS. v ROBERT -GOW REID. Witnesses i FREDERI on WILLIAM VORTH, LEONARD TWARWICK.

Copies of this patent may be obtained for ve eents'each, by addressngthe Commissioner of Patents.

Washington, D. C. 

